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Title: Superlattice structures observed in the extraordinary phase sequence and analyzed by the phenomenological Landau model and the partially molecular model
Authors: Sandhya, K.L.
Chandani, A.D.L.
Fukuda, Atsuo
Kumar, Sandeep
Vij, J.K.
Issue Date: Jun-2013
Publisher: Physical Review E, 2013, Vol. 87, p062506
Citation: American Physical Society
Abstract: We draw several electric-field–temperature (E-T) phase diagrams with electric-field-induced birefringence contours in the nOHFBBB1M7 (n=10) and nOTBBB1M7 (n=11) (C11) mixture system by changing the C11 concentration carefully; some of the mixtures show the unusual extraordinary phase sequence where subphases with the four-, five-, and six-layer superlattice structures emerge above the smectic-C* main phase. We try to understand the results in terms of two complementary models that have so far been proposed: the phenomenological Landau model of phase transitions by Dolganov et al. [ P. V. Dolganov et al. Phys. Rev. E 86 020701 (2012)] and the partially molecular Emelyanenko-Osipov model [ A. V. Emelyanenko and M. A. Osipov Phys. Rev. E 68 051703 (2003)]. The observed E-T phase diagram can be well reproduced by the phenomenological model. An emergence of the subphase with the four-layer superlattice structure above smectic-C* is also understandable in terms of the partially molecular model. We discuss the pros and cons of the two models as well.
Description: Open Access
ISSN: 1550-2376 (Online)
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Copyright: 2013 American Physical Society
Appears in Collections:Research Papers (SCM)

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